SU1237994A1 - Method of determining complex reflection factor of microwave device - Google Patents

Abstract

The invention relates to a technique for measuring at RF and microwave frequencies. The accuracy of determining the complex reflection coefficient (ECC) is improved. The method is implemented by a device containing rr of the oscillating frequency (HGP) 1, twelve-port (DF) 2, measured device 3, switch 4, phase meter 5, and microcomputer 6. At the 1st input of the DF 2, the signal of the HKCH 1 is given, and 2 The input of DP 2 is connected to the measured device 3. Then the phase angle between the signals at the 3rd and 4th inputs of the DP 2 a is measured (L с: to с sl about: 4

Description

and its tangent is calculated. The tangents of the phase angles between the signals at the 3rd and 5th and at the 6th inputs of the DP 2 are determined similarly. After determining the tangents of the phase angles, the modulus and phase are calculated, and the invention relates to the technique of measuring at high and ultrahigh frequencies and can be used to measure complex twofold reflection coefficient, waveguide and coaxial devices.

The aim of the invention is to improve the accuracy.

The drawing shows a structural electrical circuit of the device implementing the method.

The device contains a twelve-pole 2 oscillating frequency generator 1, a measurable device 3, a switch 4, a phase meter 5, a microcomputer 6

Twelve-port 2 consists of directional couplers 7 and 8 of the incident and reflected waves, frequency converter 9, 90 - phase shifters 10, 180 - phase shifters 11 and adders 12-14.

The signal from generator 1 is fed to the first input of the twelve-port network 2, to the second input of which the measuring device 9 is connected. kHz,

The incident wave signal I from the output of frequency converter 9 comes through 90 - phase shifter 10 to sum 12, to another input of which reflected wave b arrives. At the output of adder 12, the signal b + ja- is generated. The output of adder 12 is the sixth input of the twelve-terminal 2.

The signal of the incident wave a also enters through the 180 phase converter 1

volume of own parameters of each of the inputs of DP 2 from a given linear system of equations. Then, the modulus and phase of the ECC are determined by converting from Cartesian coordinates to polar ones. 1 il.

j

0

5 o

0

to the adder 13, to the second input of which a signal of the reflected wave b arrives; At the output of the adder 13 a signal b is generated, the output of the adder 13 is the fifth input of the twelve-terminal 2,

In addition, the signal of the incident wave a arrives at the input of the adder 14, the second input of which receives the signal of the reflected wave I). At the output of the adder 14 a signal is generated a + b the waves is the third input of the twelve-terminal 2,

The signal a from the third input of the twelve-terminal 2 is fed to one of the inputs of the phase meter 5. The signals from the fourth (b + a), 5th (b-a) and 6th (b + ja ) The inputs of the twelve-port network 2. 1Diffection information from the output of the phase meter 5 is inputted into Micro School 6, where the determination of the tangents of the measured green angles and the solution of the system of equations takes place. In addition, microcomputer 6 controls the operation of switch 4,

The measurement consists of the following operations.

The first input of the twelve-terminal 2 is supplied with a generator signal, the second entrance of the twelve-terminal 2 is connected to the measuring device 3. Then the phase angle between the second and fourth inputs of the twelve-terminal 2 is measured and its tangent is calculated. The tangent T ,, T of the phase angles between the signals at the third and fifth, and the third and sixth inputs are determined analogously.

3I

twelve-terminal 2, After determining the tangents of the phase angles, the module G and phase c are calculated, taking into account the intrinsic parameters of each of the twelve-terminal inputs from the system of equations

rcosg () + rsinq (T4l4.-b) +

+ r (T m4-C4) d4-T4n

rcosq (T5-K5-a) + rsinq) (T5-l5-b5-) + + r (Tjtn5-C5)

Tcostf (Tj, Ke-aJ + rsinq (Tj, lb-b6) + + T (, -C,) d6-Tgn ,.

The system of equations is linear with respect to the parameters rcosLf Psint and Г, therefore, these values are calculated according to the usual rules for solving a system of linear equations. After determining Tcostf and Tsincf, the module G and the phase Q of the ECC are determined by converting from Cartesian coordinates to polar

F. formula of invention

The method for determining the complex reflection coefficient of a microwave device, which consists in studying the editor N.Gorvat Order 3284/45

Compiled by R.Kuznetsova Tehred L. Serdyukova

Corrector

Circulation 728 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

379944

the microwave device is connected to the second input of the twelve-terminal, the first input of which is supplied with a microwave signal, the parameters of signals 5 are measured at the third, fourth, fifth and sixth inputs of the twelve-terminal, and the complex reflection factor is determined, about 10 in order to increase the accuracy, measure the phase difference between the signals at the third input and the signals at the fourth, fifth and sixth inputs of the twelve

15, and the modulus G and phase of the complex reflection coefficient is determined by solving the system of equations

rcoscp (T, K; -a;) + rsin (f (T, l; -b.) +

+ r (T.m.-C;) d.-T; n,

where t is; tgCf ;; , 5.6; qi | - the measured phase difference between the signals at the third input and the i-th input of the twelve-terminal, k; , a, b, t, s; , d; , nj ,; - parameters of the t-th entrance of the twelve-port.

Core Rector T, Kolb

Claims (1)

Claim The method for determining the complex reflection coefficient of a microwave device, which consists in the fact that the studied microwave device is connected to the second input of the twelve-port, the first input of which serves a microwave signal, measure the signal parameters 5 at the third, fourth, fifth and sixth inputs of the twelve-terminal and determine the complex reflection coefficient, taking into account the intrinsic parameters of the twelve-terminal, about 10 are different in that, in order to improve accuracy, measure the phase differences between the signals at the third input and the signals at the fourth, 'the fifth and sixth entrances of the twelve to 15 polarity terminal, and the module Γ and phase cf of the complex reflection coefficient are determined by solving the system of equations rcos <p (T, K; -a;) + rsinq>(T;l> -b-) + ²⁰ + ^ (1.mt <-С;) = d, .- Τ ·, where T; = tg (f ;; i = 4,5,6; (ρ · is the measured phase difference between the signals alami at the third entrance and the ί -th entrance of the twelve25th pole, k;, a;, b;, m;, C;, d;, - parameters of the t-th input of the twelve-port.